This Singapore Standard specifies requirements for the treatment of timber, plywood or veneer with water-borne wood preservatives which consist essentially of mixtures of copper, chromium and arsenic collectively referred to as 'CCA'. This specification covers the composition of the preservatives, the method of application and the retentions from the treatment.
Four mixtures of different composition are specified, designated as Type 1 to Type 4, respectively. Types 1 - 4 are manufactured in both salt and oxide form.